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Does the TV and system have either a coaxil or optical sockets? If it does then I would connect them by one of these. That should trigger the sound. However it might work via the HDMI if you have selected the system to pass digital signals via that connection.

It sounds like a problem with your centre channel or speaker. The sound of Voices and on-screen, actions in the middle of the screen are played through the centre speaker. General sounds such as music in the background, off-screen events, etc. will be played through other speakers on a home theatre system. Check your connectors coming from your DVD player to your sound system. Are you using a single-cabled digital connector or one for every channel? Check your sound settings as well, i.e., Surround, AC3, Music, etc.

Now,
to your question, you will not have 5.1 "surround sound" effect with
standard sound card, standard sound card will provide only three
speakers sound, rear speakers will not connect but bass should be hear. Please switvh power off to the speakers and disconnect all cables from spaekers and connect them for best quality as follows:

1. Audio from PC, orange, green and black connecting to front right speaker.2. DB15 (D-SUB) connecting to subwoofer, subwoofer is serving as mixer, power board, amplifier and connection box, control pod is just cable connection to it3. Connect all cables to they respective speakers

Establish location of the speakers, from experience, in ideal world:

1. Sub should be on about your knee level or below, about twice your hight from you.2. Front centre speaker should be about some distance as sub or bit closer on front and slightly above your head.3.
Front left and right speakers should be at about 45degree from your
axis, at distance of about 1.5 your hight and on the level of your head
or slightly below.4. Rear left and right speakers should be located
similiary to front speakers, on they level or slightly above them,
again, about 45degree from your axis.

Location of the speakers is
more actually important than it is assumed, total sound immersion is
not possible without proper speakers installation. Head in these
instruction meant a location of your head while you are listening to
your music or recording not while you are standing.

In reality...
hang them higher than your head in four corners of your room, front
centre higher than sides, woofer lower than sides and below front
centre, if they interfere with each other - increase the distance. I
hate reality...

After speakers are connected:1. Plug power cord in, 2. Turn all sounds totally down, including subwoofer3.
Increase sound on PC to maximum, let play any known to you music,
tufftuff or bach, whatever, do not bother with metallica as you cannot
discredit on it correct levels.4. Increase subwoofer volume, holding one hand on the front of the grill till you get some vibration from it5. Increase sound on centre speaker, then on sides front speakers till you achieve equality of the sound6. Decrease sound volume on your PC to about 60% - 70%7. Increse subwoofer volume till you feel sound on your hand in front of the speaker.8. Increase sound volume on front/rear speakers as required.

Hope
that short intro solved all your speaker problems, enjoy! if you
require any additional help, do not hesitate to answer to this post with
request.

These are "decent" quality 5.1 speakers, new were on about $100.00 to $150.00, have two years warranty from time of purchase.

Now, to your question, you will not have 5.1 "surround sound" effect with standard sound card, standard sound card will provide only three speakers sound, rear speakers will not connect.

Connect speakers as follows:1. Audio from PC, orange, green and black connecting to front right speaker.2. DB15 (D-SUB) connecting to subwoofer, subwoofer is serving as mixer, power board, amplifier and connection box3. White plug is connecting to front left speaker4. Red is connecting to front centre speaker5. Black is connecting right rear speaker6. Yellow is connecting left rar speaker.

Establish location of the speakers, from experience in ideal world:

1. Sub should be on about your knee level or below, 2. Front centre speaker should be about twice your hight distance from you, on front and slightly above your head.3. Front left and right speakers should be at about 45degree from your axis, at distance of about 1.5 your hight and on the level of your head or slightly below.4. Rear left and right speakers should be located similiary to front speakers, on they level or slightly above them, again, about 45degree from your axis.

Location of the speakers is more actually important than it is assumed, total sound immersion is not possible without proper speakers installation. Head in these instruction meant a location of your head while you are listening to your music or recording not whil eyou are standing.

In reality... hang them higher than your head in four corners of your room, front centre higher than sides, woofer lower than sides and below front centre, if they interfere with each other - increase the distance. I hate reality...

After speakers are connected:1. Plug power cord in, 2. Turn all sounds totally down, including subwoofer3. Increase sound on PC to maximum, let play any known to you music, tufftuff or bach, whatever, do not bother with metallica as you cannot discredit on it correct levels.4. Increase subwoofer volume, holding one hand on the front of the grill till you get some vibration from it5. Increase sound on centre button of the right fron speaker till you achieve equality of the sound6. Decrease sound volume on your PC to about 60% - 70%7. Increse subwoofer volume till you feel sound on your hand in front of the speaker.8. Increase sound volume on front/rear speakers as required.

Hope that short intro solved all your speaker problems, enjoy! if you require any additional help, do not hesitate to answer to this post with request.

The "back-left" and "back-right" speakers require special connections to the sound-card.
The "left" and "right" and "centre" speakers are connected to the "main-stereo-audio-out" on the sound-card, as per normal.

Your center speaker is probably busted since you say you here an odd popping noise from it. You will need to get a new center speaker. It is not your sound card unless the same happens if you buy a new center speaker.

i can think of two things., you may need to do the update on your sound card and computer and make sure you have the correct codec's installed or also you may need to go to the web site of the makers of your logitech speakers and see if they have a common solution for this problem...... i also wonder if you should bypass the sound card and directly connect your speaker system to the out put port on your computer ..... give it a try what can it hurt .... if all else fails maybe there is a faulty wire in the speaker system ....... ahy ?